The provided Rotor Seal & Q.R.V range is basically a polymeric disc, which creates a pressurized seal against the face seal or the stator. Our company informs the buyers that these seals may wear with time. Hence, it is suggested to keep a check on the routine machine maintenance and replacement parts. The entire collection is exclusively used on manual valves that are composed from polyimide blends. These have high chemical resistance as well as low wear. Rotor Seal & Q.R.V marketed by PNEUFLEX INC can endure pH range between 0-10, making it less prone to damages over a long period.